--threshold

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--threshold value        

 

Sets the threshold value for the images to be acquired. The device must support setting threshold values.  Some devices do not support setting the threshold level.  The --verbose option will generate a message that will inform whether setting the threshold value worked successfully or an error was encountered.

 

The threshold value can be any numeric value between 0 and 255, inclusive.

 

The threshold setting is an advanced setting that allows the device to determine the "dividing line" between black and white.  The --threshold can only be used on black and white (color 0) images.

 

Example:  Acquire a BMP image named test.bmp.  The color is monochrome (black and white), and the threshold value used is 100.

 

twainsave --filename test.bmp --color 0 --threshold 100

 

Default Setting:

The threshold value that the device determines as the default.  Usually this is 128.